Of the Northmost Winds and Skies

Jack was sure the worst was behind him by the time they defeated Pitch Black. The lonely, invisible Jack Frost became a Guardian, and his memories were gradually coming back to him. He got a new family, and children who believed in him and saw him. As a Guardian, maybe he shouldn't pick a favorite... but tell no one: Jamie Bennett was definitely his favorite kid in the entire world. So when an unfortunate treasure hunt puts both Jack and Jamie in danger, sending them back in time to a very strange island, with a very strange population - both human and otherwise - Jack can't help but think that fate really must have it out for him.

*Not my work. Belongs to @xxiiyu on AO3 I did ask their permission and they've allowed me to share this on here